Physics Momentum

How do we define impulse?

• A force that is applied at random.

• A force that is applied very suddenly.

• Force multiplied by the time of impact

• The time interval that a force lasts.

A mosquito and a truck have a head-on collision. Splat! Which has a larger change of momentum?

• The mosquito

• The truck

• They have the same change of momentum.

• Can’t say without knowing their initial velocities.

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NGSS.HS-PS2-2

In order to catch a ball, a baseball player naturally moves their hand backward in the direction of the ball's motion once the ball contacts the hand. This habit causes the force of impact on the player's hand to be reduced in size mostly because _____

• a resulting impact velocity has lessened

• the momentum change is decreased

• the time of impact is increased

• the time of impact is decreased

• none of the above

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NGSS.HS-PS2-3

The 1-kg box is sliding along a frictionless surface. It collides with and sticks to the 2-kg box. Afterward, the speed of the two boxes is

• 0 m/s

• 1 m/s

• 2 m/s

• 3 m/s

• There’s not enough information to tell.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A 4 kg object has a momentum of 12 kg-m/s. The object's speed is ______ m/s

• 3

• 4

• 12

• 48

• none of these

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NGSS.HS-PS2-2

A 5-N force is applied to a 3-kg ball to change its velocity from +9 m/s to +3 m/s. How much did the ball's momentum change?

• -2.5 kg m/s

• -6 kg m/s

• -18 kg m/s

• -45 kg m/s

Tags

NGSS.HS-PS2-1

Is momentum conserved in this collision?

• Yes

• No

A 1-kg ball has the same speed as a 10-kg ball. Compared with the 1-kg ball, the 10-kg ball has

• less momentum

• the same momentum

• 10 times as much momentum

• 100 times as much momentum

Tags

NGSS.HS-PS2-2

An elastic collision occurs

• when two objects collide and then bounce apart

• when two objects collide and then stick together

• any time two objects collide

• only if one of the objects is a rubber ball

An inelastic collision occurs

• when two objects collide and then bounce apart

• when two objects collide and then stick together

• any time two objects collide

• only if one of the objects is a ball of clay